Install guide

ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Section III. TROUBLESHOOTING
3-9. Troubleshooting. Troubleshooting actions for a
series of malfunctions are listed in table 3-3. The
probable causes of a malfunction are listed in order of
most likely occurrence or most logical troubleshooting
procedure. Troubleshooting steps should be performed
in the order given.
a. Software built-in-test features provide additional
diagnostic capability when the CDU and computer are
operating at least partially. Troubleshooting procedures
using this capability are given in table 3-4.
b. The system should be inspected for physical
damage which would prevent proper operation. A bro-
ken porro prism assembly or one with a damaged
mirror surface requires replacement of the IMU and
memory unit.
-
Isopropyl alcohol is flammable and gives
off harmful vapors. Use only in well-ven-
tilated area away from open flames and
sparks. Avoid prolonged or repeated inha-
lation of vapors.
Do not remove top cover to IMU. The
IMU is a sealed unit and is to be returned
to depot for repair.
c. If a unit is opened for repair, inspect for water
penetration and/or corrosion. Carefully clean off corro-
sion products with isopropyl alcohol and a soft brush.
Inspect gaskets and other sealing devices and tighten or
replace as necessary, If a circuit card is removed,
inspect for bent or broken connector pins. Carefully
straighten bent pins. Broken pins are replaced at depot.
Change 1 3-11